I am starting a new thread on this (slightly different) subject:

The speaker (hereafter known as buzzer) was bad and I am trying to replace it with a replacement (definitely not oem) which I got at RadioShack:

It turns out that the new buzzer beeps correctly when close to an object, but has a constant, low-level, high pitch scream when the ignition is on, trans not in park - just loud enough to be annoying. So, I have some questions of a fairly technical kind:

Why would there be current to the buzzer when not in Park? I wonder if there is something amiss in the park-aid module that knocked the original buzzer out? Does anyone out there have more info on the whole assembly - like specs?

The buzzer I got from RadioShack has a 3-20vdc rating. I bought another buzzer (another $3.50 down the tube) with a 12 vdc rating and tried that. It works, barely, too quiet to the point of inaudibility. I cannot tell if there is a high tone pitch from that one. That seems to indicate that voltage spec is critical. (I do not know what the spec for the orig oem buzzer is.) I put a voltmeter on the buzzer leads from the module and I got 10.4 volts constant when not in 'park,' and the same 10.4 volts plus a little spike (maybe 0.4 volts) that triggers the beeping.

I might have to pay the $80 to someone on eBay for the oem buzzer, but I do not want to do that if I get the same the high-pitch sound from that one.

I am puzzled.

Stephen